I would love to find a schematic for the Connie but specifically need to know the functions of the wires on the two-wire plug and four-wire plug going from the engine to the tender.  Thanks.  J

Recently I asked about simple R/C trains that were fairly realistic and simple to operate.  It was to be a gift to some young boys who have shown an interest in the hobby.  I got a number of helpful suggestions. 
We have been out of town to attend a graduation and help a daughter move. I just got home and there was a box containing an almost new R/C Bachman Big Hauler.  There is no return address and I have searched tons of stacked up emails and can find no mention of this.  Obviously there are still angels among us. I would like to compensate someone for this (The postage alone was $16.)  I would also like to know how to insert batteries into the engine or does it require there track power?
I’m going to post this on two sites because I originally asked my question on two sites. 

Amazed,  Julian 

I would like to have a simple and rugged R/C train that visiting children can run and handle.  Can anyone point me in the right direction?